A VERY interesting paper on the effect which settlement in Australia has produced upon indigenous vegetation, by Mr. A. G. Hamilton, appears in the new number (vol. xxvi.) of the “Journal and Proceedings of the Royal Society of New South Wales.” Mr. Hamilton traces with great care the results which have sprung from the direct action of man. He then deals with the alteration of the flora by the introduction of a new fauna, and the modification of it by the destruction of the native fauna. Finally, he considers the introduction of a new flora, and the consequent modification of the indigenous flora through competition.